Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session ZC28: Geophysical Fluid Dynamics: Atmospheric II
12:50 PM–3:00 PM,
Tuesday, November 21, 2023
Room: 152A
Chair: Marc Calaf, University of Utah
Abstract: ZC28.00002 : Is Turbulence Anisotropy the missig ingredient in classical atmospheric surface layer turbulence theory?*
1:03 PM–1:16 PM
Presenter:
Marc Calaf
(University of Utah)
Authors:
Marc Calaf
(University of Utah)
Ivana Stiperski
(University of Innsbruck)
However MOST suffers from significant failures that limit its applicability like the lack of scaling of horizontal velocity variances under unstable thermal stratification, the non-scaling of surface-normal velocity and temperature variances in stable stratification, as well as the general breakdown of scaling for intermittent turbulence. Furthermore, MOST also fails in representing land-atmosphere turbulent exchanges over perturbed surfaces (e.g. heterogeneous landscapes, complex terrain, etc.), where the original MOST assumptions breakdown. It has now been long hypothesized the need for an additional non-dimensional parameter that is able to encapsulate the missing information. In this work, we suggest using the metric of turbulence anisotropy as a remedy for generalizing the representation of near surface turbulent exchanges over perturbed surface conditions. To demonstrate its potential, we use an unprecedented set of atmospheric datasets representative of a wide range of different surface and flow conditions. The resulting novel scaling relations not only offer a path-forward in addressing a 70-year old problem in ABL meteorology, but also provide a deeper understanding of turbulence, and its role in the surface-atmosphere exchange over realistic terrain.
*M.C. is thankful for the support of the National Science Foundation Grants PDM-1649067 and PDM-1712538, as well as the support of the Alexander von Humboldt Stiftung/Foundation, extit{Humboldt Research Fellowship for Experienced Researchers}, during the sabbatical year at the Karlsruhe Institute of Technology Campus Alpin in Garmisch-Partenkrichen.
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